Improvement in lifting-jacks



M. SHERMAN Lifting Jack.

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I WW4 N. PEIERS, PHOTO UTHOGRAPHER, WASHINGTON n C UNITED STATES PATENTOEEIoE.

BENJAMIN M. SHERMAN, OF FLINT, MICHIGAN, ASSIGNOR OF ONE-HALF HIS RIGHTTO THOMAS VAN S. ROGERS, OF SAME PLACE.

IMPROVEMENT IN L lFTlNG-JACKS.

Specification forming part of Letters Patent No. 202.197, dated April 9,1878; application filed March 7, 1878.

To all whom it may concern:

Be it known that I, BENJAMIN M. SHER- MAN, of Flint, in the county ofGenesee and State of Michigan, have invented a new and usefulImprovement in Combined J ack-Screw and Lifting-Jack; and I do declarethat the following isa true and accurate description thereof, referencebeing had to the accom: panying drawings, and to the letters ofreference marked thereon, and being a part of this specification, inwhich Figure l is an elevation of my improved device. Fig. 2 isavertical section, showing the rotating head or bearing-plate.

The nature of my invention relates to the combination in one machine ofa jack-screw and lifting-jack, so arranged that it may be used as ajack-screw, a lifting-jack, and a track-lifter and stump-puller at will,or be used as a combined machine, as may be desired.

In the drawing, A is the base of the machine, preferably made of cast ormalleable iron, and B is the standard, made of a suitable size andlength of metal pipe, with a male thread, a, out upon its outer surfacefor about three-quarters of the length of the standard, as shown. A nut,0, provided with a female thread corresponding to the male thread of thestandard, and also provided with a lug,

' b, engages with the standard. To this lug is Arms F, one upon eachside, constandard. The machine, as thus constructed, is an adjustablelifting jack, adjustable to varying required heights by means of the nutand threaded standard, and lifting by means of the lever and itsconnections; but, owing to the rigidity of the cap on the plunger-rod,it cannot be used as a jack-screw. To enable it to be employed as ajack-screw, I attach to said cap a revolving or rotating head orbearing-plate, I.

When the machine is placed under a weight which it is desired to raise,and the depression of the lever not raising the weight to the requiredheight, the lever may then be used as a sweep to run the nut farther upthe standard until the desired end is attained, the rotating headI'allowing this to be done.

K is a hook, bifurcated at top, where it is pivoted to the bolt, bymeans of which the arms F are pivoted to the cap G. The addition of thisfeature enables the device to act in the triple capacity of alifting-jack, a jackscrew, and a track-lifter and stump-puller.

What I claim as my invention 'is- 1. In a lifting-jack adjustable tovarying heights, and in combination therewith, the revolvingbearing-plate I on the top of the plunger-rod H, for the purpose ofallowing said lifting-jack to be employed as a jack-screw when desired.

2. In a lifting-jack, the combination, with the hollow standard B,having male screwthread a, of the nut C, lever D, arms F plunger-rod H,and revolving bearing-plate ,constructed and arranged substantially asdescribed and shown.

BENJAMIN M. SHERMAN.

Witnesses H. S. SPRAGUE, CHAS. J. HUNT.-

